barcode data qualifers

How do you prepend the barcode data with a qualifier in ZebraDesigner for Developers? Such as a P for Part Number, and Q for Quantity.
For example I'm using customer's D365(ERP) object $ItemID$ in the barcode, and lets say the ID is 12345. I need 12345 as the human-readable, and P12345 would be the scanned barcode data. I don't see a place in the designer to prepend the barcode data. Any ideas?